[mrtg] Re: MRTG to monitor Gigabit-ethernet with counter32 and interval: 1

Tue May 27 13:17:19 MEST 2003

I ran into a similar situation in the past when the particular Cisco
switches I was using did not support 64-bit counters.  As a short-term
solution, I put this required config into a separate config file and
scheduled a dedicated mrtg process to run every minute.  It worked very
well and identified traffic levels in excess of 114Mbps (sorry I can't
remember the peak value). A couple of points worth mentioning: -
- this was straightforward mrtg (no rrd)
- I called the mrtg process from a scheduled job every minute, not using
RunAsDaemon or interval settings (although this may work just as well)

I have since upgraded the switches to ones with SNMPV2c support and I ran
both the mrtg processes in parallel (SNMPv2 counters every 5 minutes and
SNMPv1 counters every 1 minute) for a period of a few days proving that the
resultant graphs and averages were pretty much identical.

I haven't had the opportunity to migrate to rrdtool but this may also be a
way forwards.

HTH

             "Michael                                                      
             Markstaller"                                                  
             <mm at elabnet.de>                                            To 
             Sent by:                  <mrtg at list.ee.ethz.ch>              
             mrtg-bounce at list.                                          cc 
             ee.ethz.ch                                                    
                                                                   Subject 
                                       [mrtg] MRTG to monitor              
             27/05/2003 11:54          Gigabit-ethernet with counter32 and 
                                       interval: 1                         

Just a quick question, I have to monitor a 3Com Superstack 4900 GE-switch
which seems to have no SNMP-v2c at all and so no 64Bit-counters
ifHC*Octets.
So far so bad, I understand the whole problem; when traffic hits 114 MBit,
counters wrap etc..

A possible way out I thought of now is to run MRTG (with RRDtool for sure)
more often with "Interval: 1" which should give me at least graphs up2
~570Mbit.
Am I right ? Anybody done this that way, is there something else to
consider ? I created the RRD's with mrtg-2.9.29, are they capable to handle
the high values by default or do I have to alter them (I'd find out how)
I thought to create a separate mrtg instance only for these two switches to
not tamper the other graphs.
Just to make sure: I really don't want to make mrtg run with a higher
resolution, I only want to monitor the GE-ports with 32bit-counters.
another question (I know it was asked a thousand times, but only to enhance
resolution which I don't want to): is it possible to set interval to .5 (30
seconds) to poll the counters even more often and be able to see the whole
workaround this completely ?
I read & tried everything possible now, maybe somebody can only
acknowlegede "interval" helps me out. (or tell me it's impossible, then
I'll go to 3Com and tell them to have a deeper look on rfc2233.

Michael

-----Original Message-----
From: Michael Markstaller
Sent: Tuesday, May 27, 2003 11:33 AM
To: giochi at telvia.it; mrtg at list.ee.ethz.ch
Subject: [mrtg] Re: Mrtg for monitoring CPU and disk space

you should be a little more specific, what type of box are you talking
about. then look on the mrtg-page and search the archives:
http://www.google.de/search?num=100&hl=de&ie=ISO-8859-1&q=cpu+disk+%22+site%3Awww.ee.ethz.ch&meta=

or search for hrStorage and hrProcessorload in case your box supports
HOST-RESOURCE-MIB

Michael

-----Original Message-----
From: giochi at telvia.it [mailto:giochi at telvia.it]
Sent: Tuesday, May 27, 2003 10:29 AM
To: mrtg at list.ee.ethz.ch
Subject: [mrtg] Mrtg for monitoring CPU and disk space

Hi alls,

I would like to know how to monitoring cpu and disk space because I have
installaed mrtg but I see only the graph of eth0 and eth1.

Probabily I must add something to the snmpd configuration.

Could someone help me ?

Thanks in advance.

Fabrizio

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